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# error kind ExecutionFailed
# pre-build errors command failed: exit status: 101
# rustc version rustc 1.99.0-nightly (1a98b1e13 2026-08-07)
# docs.rs version docsrs 0.0.0 (c0e43eba3fa5e6341d933cf845300a19b1ac3e4e 2026-08-06 )
# build log [INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "DOCS_RS=1" "-w" "/opt/rustwide/workdir" "--user" "1001:1001" "e449b3afecd1fc95a1239ddecce0d46d9272e72cd9c4bfedc2b06f970994520e" "/opt/rustwide/cargo-home/bin/cargo" "+nightly" "rustdoc" "--lib" "-Zrustdoc-map" "--config" "build.rustdocflags=[\"--cfg\", \"docsrs\", \"-Z\", \"unstable-options\", \"--emit=html-non-static-files\", \"--resource-suffix\", \"-20260807-1.99.0-nightly-1a98b1e13\", \"--static-root-path\", \"/-/rustdoc.static/\", \"--cap-lints\", \"warn\", \"--extern-html-root-takes-precedence\"]" "--offline" "-Zunstable-options" "--config=doc.extern-map.registries.crates-io=\"https://docs.rs/{pkg_name}/{version}/x86_64-unknown-linux-gnu\"" "-Zrustdoc-scrape-examples" "-j6" "--target" "x86_64-unknown-linux-gnu", kill_on_drop: false }` [INFO] [stderr] warning: Rustdoc did not scrape the following examples because they require dev-dependencies: optimization_check, simple_demo, web_server [INFO] [stderr] If you want Rustdoc to scrape these examples, then add `doc-scrape-examples = true` [INFO] [stderr] to the [[example]] target configuration of at least one example. [INFO] [stderr] warning: target filter specified, but no targets matched; this is a no-op [INFO] [stderr] Compiling libmimalloc-sys v0.1.49 [INFO] [stderr] Compiling auto-allocator v0.1.0 (/opt/rustwide/workdir) [INFO] [stderr] error: failed to run custom build command for `auto-allocator v0.1.0 (/opt/rustwide/workdir)` [INFO] [stderr] [INFO] [stderr] Caused by: [INFO] [stderr] process didn't exit successfully: `/opt/rustwide/target/debug/build/auto-allocator/527962a7edb8cdee/out/build_script_build` (exit status: 1) [INFO] [stderr] --- stdout [INFO] [stderr] cargo:rerun-if-changed=build.rs [INFO] [stderr] [INFO] [stderr] --- stderr [INFO] [stderr] [INFO] [stderr] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ [INFO] [stderr] ❌ AUTO-ALLOCATOR COMPILATION ERROR [INFO] [stderr] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ [INFO] [stderr] [INFO] [stderr] 🚫 Cannot compile on this system: mimalloc requires modern GCC with stdatomic.h [INFO] [stderr] [INFO] [stderr] 📊 System Information: [INFO] [stderr] • Detected GCC version: 15.x [INFO] [stderr] • Required GCC version: 4.9+ [INFO] [stderr] • stdatomic.h available: ❌ No [INFO] [stderr] [INFO] [stderr] ℹ️ Note: You may see additional 'libmimalloc-sys' compilation errors below. [INFO] [stderr] This is expected - the same stdatomic.h issue affects mimalloc compilation. [INFO] [stderr] [INFO] [stderr] 💡 Solutions to fix this issue: [INFO] [stderr] [INFO] [stderr] 🔧 Option 1 - Upgrade GCC (Recommended): [INFO] [stderr] CentOS 7: sudo yum install -y centos-release-scl devtoolset-11-gcc [INFO] [stderr] Then: source /opt/rh/devtoolset-11/enable [INFO] [stderr] Ubuntu: sudo apt-get install gcc-9 [INFO] [stderr] [INFO] [stderr] 🔄 Option 2 - Upgrade OS: [INFO] [stderr] CentOS 7 → CentOS 8+ / RHEL 8+ / Rocky Linux 8+ [INFO] [stderr] Ubuntu 16.04 → Ubuntu 18.04+ [INFO] [stderr] [INFO] [stderr] ⚡ Option 3 - Use system allocator: [INFO] [stderr] Remove auto-allocator and use Rust's default system allocator [INFO] [stderr] (No performance benefits, but maximum compatibility) [INFO] [stderr] [INFO] [stderr] 🎯 Why this matters: [INFO] [stderr] auto-allocator provides 1.6x faster allocation performance, but requires [INFO] [stderr] modern compiler support. Legacy systems cannot benefit from this optimization. [INFO] [stderr] [INFO] [stderr] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ [INFO] [stderr] warning: build failed, waiting for other jobs to finish... [INFO] running `Command { std: "docker" "inspect" "e449b3afecd1fc95a1239ddecce0d46d9272e72cd9c4bfedc2b06f970994520e", kill_on_drop: false }`